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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfb92a5bd66324fe6102a760050a7eec6d3dd149b4cf0f01cca84217f5991b6' 
  AND token = '39tbtODEsoWZ+MMhIQh+4U11onrWX7l3l94HLD2ch7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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