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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91278f24c56b57afce39d703d6ef89a56078be3798ce331c1269d67481efd4f9' 
  AND token = '7kBf84kZnWNCYv8JjthP2JEyu4xczJoFbPbqhux/e2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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