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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b2eabe0ef32e91d77f24ccb2d0a9247a594f7d460034860faae80457cff61b' 
  AND token = 'dQwr6k2XFEcALqnvSjFAdGhZ0YidG+G+g0yPp2k8OLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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