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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8400446e1a83c5cc52688d95f9ece206d4f09e73e09f1fd984adf2137db4aa8' 
  AND token = 'JkPVtEzKrCMJFT8QKdzsiDB0ICMPf961/cU1+qSaemU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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