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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b3b7621386aef34ab8f328db44d5e5b96b8dea02503769e17f48f54b37c6dd' 
  AND token = 'h/QMpemCMhGZfyQiPXIIVAbjPUQzH7i1erYmt55i5VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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