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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585869c4374c9a3e478435abd9e4669cb030fa8d7e51f71ff6cd8c7e722b1543' 
  AND token = '05t6kfxBhlAnqE/vkGrTdN3iJY3nGrOhpLw072EfHDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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