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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c2e195dfbd76deb043bea730e7dea6d87c46b212232e3d91943f89317fba77' 
  AND token = 'bUXfd6zgOrggTtPc0FvUlQpLkNm8q+GBd6hwo54m9Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}