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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc173838f63f8760cfcc98b11ee98cbfa61c22f74b434b7cdc8b12571de7c2ca' 
  AND token = 'I2nuBa3U4azkj4ES3cPsjlxtctA3tpMrtDuCMEOr40g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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