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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7680c1c76f4a8abb2c89e4b867f32eb9b5ec13eafa5a2b1b5093410043c7c66' 
  AND token = 'w1C3EEfy9kpId7cPJGo6b0XkVX5f0+C2ptGyHYtmn3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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