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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19f1d54464081a7e199ffac5c5f4f38b96984a04f4a889ec108c66801d76779' 
  AND token = '31I8lsAkWZSuCB1NDT42M42C6fDGVoWFNNtIOxUCahw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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