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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98b4ea1233192b8bcbfa605388b2d02a9f70eb1b7c71a251de12878f54b8dbd' 
  AND token = 'Rvt3zOS3GRme1oZ/N0yH3e/MvgCX1bDSIodOJtmVZXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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