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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705663e30bf2b911cc9ad4a3fbcc20b2564abb8fdab65f48efea55c6061cf06c' 
  AND token = 'WjrBuz32C0/WP6HvqKS6NHTsvsrn2Qx1WuisuPMrkM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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