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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93bb9e3e7fc9caab86c2f87d25546d5d9e2a7cd7176a8029395c72c0598a7ee' 
  AND token = 'x8opqoe1sPoeSXd+Lc8fjh28WvQPgMBHuEJDqzD5+PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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