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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084f49ca4ac2955ca8cfb2d6ad6cfb3f3e64938365b6ef2d9aee0b1cee240d20' 
  AND token = 'UWcuRYv6pbxcgn3jEwap6DPVcBo0snp6doQW0qH8XiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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