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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af42706ddf3a646d395931cbfb68d014010112728d55b3159d863ffec22a67d1' 
  AND token = 'cjcdPxEq9lw81fkBx9iKgttCmH1Pf1wWZBRsS88XB/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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