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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4ff247a2f0222f133becb3895eba350dc4e93269b2c93f86606956e5434fac' 
  AND token = 'ATa2SPb1Agqn2JNYoEifuC0SjpNurYvH6KSJV9KV/aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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