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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f921d06fe4d5e108bd3409d1182054ac36f58f67ce012d239486aa1390fee4' 
  AND token = 'Hs5FWqifzRxQSHWaowKcUIOHNcRH/WryNgAme33PkAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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