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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677d71d7829a1090fb4429709bb21fb8588e4bcc7bb31d95703db6fbe66e7814' 
  AND token = 'IhXbzU80K4AxK8o+YHFwPdNWQ8Q/EEYdeizyXyI0e6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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