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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16420f81c0c479952426ddf20f8993fa3d451fd081080fe9f6d9b40463ce331e' 
  AND token = 'Yn/RGP+mHq4dEnAT3rqqO7vYEmsOrXraiv880YtfKts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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