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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7ce145541384596a0fc7a46b9056c60fe770109b7213a30fac3728633fb3e5' 
  AND token = 'Y1U+mAHxKM1lOKVUYPG8MTX/1ip1LvM4ja2Y+3R5pIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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