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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '500d2f36a7e56e8b0f950ac26c633e7f095389f6ebaba1a2817a3d55a9c909ed' 
  AND token = 'vvmTQpVRZ/7ctUxuQaN++v1pDbPxVgcy9IG2jmNK624=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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