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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e74679b916b6258c0f3994c271dcebbde9cdce787f6a2e51547f0740c46cc1' 
  AND token = 'M9/FO/7sPSkRJl/iwjGqtktshBP8P7WU/KBYIQT0lck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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