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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e084944bc46c544237e09654c7632143fe8244b109079fa634636545bf29e6fa' 
  AND token = 'cjQIKwuL98Olmym7LTTC9r/E/tkM4Uttwep56199Lt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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