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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812fd28793cedd625300a3c9fbd79c7c2ea5868b237f6bba24e38847c23875bf' 
  AND token = '1160wN7YYxnGyWcj2/oe6TSf5ccZie4Jo1ydjGc4bHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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