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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f423d3cb78c923487f19c7306aed997febbb064b275d665c08d22721ad0c20' 
  AND token = '8Jb/O/zECb1GIQA6em5dyB93OuseXxTVh8Z/GnnD/5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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