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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988bce967050a38b058aa5de3aa3b7a3a588c8460c49e1ed75f353274692d7b2' 
  AND token = '+Q72tTuggVJhBuMgfxD2M7Qf6BwtjVO3KMd0HLAoZ2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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