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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a6a4bd06e21dd94067f4d4b89b63e339769e9010e300b1dfe1514d84ec8c7f' 
  AND token = '/hUAwl2xPE9xKY9DTed2Sw7Ol7Avlpunex1xKV+pvac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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