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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adac281c97708f52e079cab583a1b5036586a075f5b01190211ad511e2a62b3c' 
  AND token = 'BE3neP7hs5z9bZVfSHRZrYrOzBUY8ijiu1kc0ZCjAek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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