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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa1cf04a3b1be20024350c3cd470b5c6130cd97f0be098e549b9e2c325d036e' 
  AND token = 'YSg4AfefaVrdS1jjyVMrwvQLu1OhuazUyzMEMtDsOWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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