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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd942e9f595f1c3f04af50dfb19015b6148e4b84112ce5942e3a8592d846348' 
  AND token = 'O+t8jkn1CA9D2AvbdpFghYxVk32zdfdVcwncjb8yVQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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