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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f65195e21aef80ba3893e465d331b307ee893eef90092918ba7475898ce75c5' 
  AND token = 'RQNdkqicwPhdp93jroCuUdF9Oi8YN5tB2gvbXCQNv0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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