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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31645447f7d96fe0f1caab2a3afaa340f3e9371ae5c8c57eac6e9265787be93c' 
  AND token = 'utajMoNuZXdBKoQ5B2S7s4d6SNP3vU6pvbtbwKrF6Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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