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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f154e51103e43c8dcb3116df6f53b3b00c5fd2f4ae270006ed3fa7a1b6e9bd12' 
  AND token = 'WAG5YUzsVRn7+Jl8I9nzsLao1D3iwEGteZuN9eK0kPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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