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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4574eb41c6a9d8188f82598a200af8ad6e863302dbc584194f464d5b32b6120d' 
  AND token = 'e2FGD8bttx+vh8JvrcJw7DOK8k/ySomHhFTvlR8kyAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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