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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174c7eb31e532a2d16e30d9b211392f969f720d0ba64b75177d535494ff6cfaf' 
  AND token = '5b/ugSM7nHZ4lVpr/rZpc+kXFzhp9pra0iNXMqJ9i2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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