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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c46b56717b20ca80a442f628c92fe73c5fd0a64b0b95e76b391da507c4b029' 
  AND token = 'LaG0Hj8idykci0THdd8d7mxmahtdArLbjsRhbmji5WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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