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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c704e2618e1aebf1573b4efad87b06d2590d39b3bb52016f81f11848cca5128e' 
  AND token = 'y2aJYIiBRW/7FkABWNR2lDNZdtAEwdNmDGVJ0kyjwqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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