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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a44222d067a95027fc403ed9bb8660ef61c983cea6de146108c0496c385f01' 
  AND token = '76IHknF55z6cWXZyMphGkr+SXiDZXtXUp1NUtElqUks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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