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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb7bbde8d2e327143ca0521efddfa0f5dc057fe61266391e40efe511b953f73' 
  AND token = '2XA/gxWy1hBjDaHe7FgxYnCteh86+OOaazoZb64Rl+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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