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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a2ba1e319a947ef2a129c1be3099454f19fe35622c936b3ee9c323fc1061ff' 
  AND token = 'vIAsrKPQv+yUuLe+iyo6maQgVXWLYQp/bHZg+JqmjD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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