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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dfed25dbff0c983fe8145c11be9fadcb6cff4b51362292bdb3e677073f685e3' 
  AND token = '3ZtSGmb44zN3KyqRLnDCn7iSVH2C9IuQExAOSsfHxRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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