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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beabe173d4fc77c5fa6d9bca076637f7c0b2baaf49dd0c6557a11eb80b8ddea9' 
  AND token = '/nZcXbSYReXJql20Jt0XyOioJpa8694M/eOC6wYfn/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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