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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49b49569d8c58e6c6ca46459200cced79f69e07127ea2acd024b6c579a4db433' 
  AND token = 'i+QwEv4iS/0yGKrJ5ilpvY7M0tyS5XbNifA3W3IwAhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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