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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'debb1c5394ca47274a12c0434bbf6166988cb198cd6ac21b56efdcb66806bb62' 
  AND token = 'VMS0/k/BXRLpgI32xV8PiPFbQ16kjoNGLNP7MJVWj/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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