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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc38d1ef737ed855076bfdde825562a2ad60d2c9c5e6f4c4f4421b8e7513c84' 
  AND token = 'UGSJBB9VI4tzv8zNgbrFfQG5s5LxDDI04GW2pE3RwUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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