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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25d6faf36c9956cd3bda9909cc87b8355e341ab7563b1987dd79821e2d7332f' 
  AND token = 'NUSqRdwnBuBYi82A7GieoaZTbx27KEYp8vvnYO65lGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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