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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85958600c0a776cb01b52499e6b88e44a8b78c925616a03df3a922478819ea0' 
  AND token = '5rKOMFWQfq8YcJEeuu5B+jazb1G0aFbkyRSBuTYlwvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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