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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718a159a3da2716bd11fd036d02d3bf201c8eb9a98f98119715d0cb0a9825ceb' 
  AND token = 'RESp2sbY0WzOyYcsZneR8R0SWzyXDYyqvi3VRyralZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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