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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02ffc6f5281f4c74f3e45b03bba72f9863539b911ede89855466758095a5c45' 
  AND token = '+fCZK2mB6QZ9gguRw6eO+r5oRaC9q+R5r2RAMNJz8is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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