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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd695b161fc49f325d1607e83ea7c5abce061cfa1c103feb7f048fdb1bef5fa53' 
  AND token = 'kjXkZj92CI0a28HOHqLgPmF3UA8X7as71G80A/2CW2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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