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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584aeaa1d5b7dfc59d58d7490269179e245b093fc25507134d735d007148289d' 
  AND token = 'wLRRL61yzQHIkepi2PeZj6bSxf0toOD5ft+IfxW22M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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