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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a108df312e1e342b628127fe6890b2f9e1d436141b0ffeba33c9a5d0af9e1fb' 
  AND token = 'IuAHkksQGQ+bx9yA9DbwsRTA6rJyACQdRu/M5ccuq1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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