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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f109fca21703b9e0b2e1a91cb653ef7a6e4e96398034dc6f696a0304a38eb475' 
  AND token = 'w3qPbY7nb8BiqaUm7d3gMp1O5Lswkvg75Hjj6eBgqU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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