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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dc4097afb47764e88fe1bc18457e4c3593e402a3cf66506c0aff803616da1d' 
  AND token = 'Wler6Z1zq2s9f4HunNhhTU5dIaxsk6eJDaDJsGok43o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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