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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6bd3387ac6428730bfc9ec132cc4de97ba012b80264a60763e71758fc8b218c' 
  AND token = 'phQ9G15kAkXSskr3o+PyOcSAlnV/mbIHcFwiqcHBolw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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