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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb025525e9e66ab7d42d68c3ec39755e8260d137be3b8912d09162f2b11652f' 
  AND token = 'c98967GaAwC9vlnoMIBXHseFhlEBlg7skVXzDYsT620=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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