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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1a41c70cf4c5c490bcf3482f0039d691471d18590c5516860f0c0c3e660fed' 
  AND token = 'NuK56dFOIy3l+EPO4XBX5OBX7rUplMppCAxO4aJHVLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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