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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54023bd94d42a9f38427b0715d4b0edc9413fc7315819ec8f7e3a67df4c8dff5' 
  AND token = 'SNaCetPJnYlnnlcqScZyTaIJ6wUI2WlwNGzx/ixdbzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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