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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463c6745239a35156c0c6c929f7711f5dc8aeeaf439d18aeccd554104ef0a089' 
  AND token = 'Vo7EZUgeUhvRpmRoXR8PNrSclACMjH6rQQSYK5ZO+L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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