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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdc55e60cad21e3294e335e97117efce157e974a7b43127df803c82eadd6289' 
  AND token = '+4tJAmL7M75cPPpL7A84pMPChL+wTULib1BZvOQ8fqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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