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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '227e594471d11081dc47652ca75602245fd897d8b50d9dfccc43bc446d8fd7a5' 
  AND token = 'YD5atUuIUG4haZeDuEviE8SX/MX3tNmgbJhpVPAApmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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