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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0ce675ee6c179d96c583c845882b427df9232c76a643c02da5b0be5f2b5b1f' 
  AND token = 'wAUMOTRS0r6wRtk/XjHwmwPs7nWApxR/Ma7l7S+BHI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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