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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505caa96f7eed239eeaab7c2c1a0d52eb230d01462a07e836b3a243c904ee6d3' 
  AND token = 'JsLAJkAkSJ5MHw+qYPF16ck2XFfgoX3oD1NZOPkusb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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