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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabb6d0af78ccc501ce201176108a456b96cfd904118ea957cb916df376061f5' 
  AND token = 'eBSlsi/fiD40jXQdFqsF8a2PAuQ69RaigJ3/356xnko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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