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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc56a34cc566b3216ad961904a27ed5aff37512646e1c66766f2cf1b68cbe06c' 
  AND token = 'wVcHn2EbpL/l4w6bT7Xe5911sWB6HzLqOAcyQeaqGaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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