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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48dfe86c9d823da065d42a49286e7d17e3b32ff8e542b78a07ea4b7d04b62c2' 
  AND token = 'befMdzR7OpfKbEf8HCmH7vMyWlNTXjEXSGB+75uLOp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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